Friction member for brake mechanism in camera shutter

Abstract

A friction member for a brake mechanism in a camera shutter is comprised of a layer-laminated body which is formed by laminating a plurality of resin layers each reinforced with carbon fibers aligned one-directionally in such a manner that the directions of the carbon fibers are crossing, for generating a frictional force to brake a member to be braked by coming in contact with the member to be braked. The thickness of the layer-laminated body is 50 mu m to 200 mu m, and the surface resin layer of the layer-laminated body contains 35 to 75 wt % of the carbon fiber.

What is claimed is: 
     
       1. A friction member for a brake mechanism in a camera shutter comprised of a layer-laminated body which is formed by laminating a plurality of resin layers each reinforced with carbon fibers aligned one-directionally in such a manner that the directions of said carbon fibers are crossing, for generating a frictional force to brake a member to be braked by coming in contact with said member to be braked, characterized in that: the thickness of said layer-laminated body is 50 μm to 200 μm, and a surface resin layer of said layer-laminated body contains 35 to 75 wt % of the carbon fiber.   
     
     
       2. A friction member according to claim 1, wherein lubricant is preserved at least on the surface of said layer-laminated body. 
     
     
       3. A friction member according to claim 2, wherein the layer-laminated body has a three-layered structure, epoxy resin is used as matrix resin in each layer, and the carbon fiber is made of continuous fibers. 
     
     
       4. A friction member according to claim 2, wherein the layer-laminated body has a three-layered structure each layer of which has epoxy resin used as matrix resin, and is comprised of a pair of surface resin layers with the carbon fiber made of continuous fibers and an intermediate layer with the carbon fiber made of short fiber. 
     
     
       5. A friction member according to claim 2, wherein the layer-laminated body has a three-layered structure each layer of which has epoxy resin used as matrix resin, and is comprised of a pair of surface resin layers with the carbon fiber made of continuous fibers and an intermediate layer added with carbon black. 
     
     
       6. A friction member according to claim 2, wherein the layer-laminated body has a three-layered structure each layer of which has epoxy resin as matrix resin, and is comprised of a pair of surface resin layers added with black carbon. 
     
     
       7. A friction member according to claim 2, wherein the lubricant is of grease type having the consistency of 400 or less.